A double XP weekend is now underway for Call of Duty: Black Ops, which will run through Tuesday morning. Here's word:

To celebrate their 10 millionth Facebook fan milestone, Treyarch is hosting a Double XP multiplayer weekend starting now and extending it through 8:00am Pacific, Tuesday, May 10. Anyone playing in multiplayer matches of Call of Duty: Black Ops will earn double XP rewards and level up.